Here we have clock keys in all the sizes available. We get many calls asking what key their clock takes and over the phone it is difficult to say you need key size this or that. Best to read the below text on how to use the clock keys chart and get the correct sized key to wind your clock. What can be said is most larger German movements take a number 8 key. So if your clock movement is made in Germany, is 5 x 5 square or 6 x 9, it will take a number 8 usually. If the clock movement is made in Germany and it's round or a small rectangle it's usually number 4. If you have a 31 day clock, or a Korean clock, or a commonly produced early American time strike movement, then it's usually number 7. However, if you want to be sure with all this then use the below chart.

To get the key you need, measure the shaft the key is to go on to, then use this chart to get the key size # you need. Please do not call asking what key your clock needs, as you will be told it would still have to be measured. Again, you are measuring the shaft that the key goes onto in MM and then using the below chart.

1 CM = 10 MM

25.4 MM (2.54 CM) = 1 inch

German clocks (post 1960) take a number 8 or 4 key

    Shaft width / Key # needed
  • 1.75mm = 000 Key
  • 2.0mm = 00 Key
  • 2.25mm = 0 Key
  • 2.5mm = 1 Key
  • 2.75mm = 2 Key
  • 3.0mm = 3 Key
  • 3.25mm = 4 Key
  • 3.5mm = 5 Key
  • 3.75mm = 6 Key
    Shaft width / Key # needed
  • 4.0mm = 7 Key
  • 4.25mm = 8 Key
  • 4.5mm = 9 Key
  • 4.75mm = 10 Key
  • 5.00mm = 11 Key
  • 5.25mm = 12 Key
  • 5.5mm = 13 Key
  • 5.75mm = 14 Key
  • 6.0mm = 15 Key
Brass Key Brass Clock Key

Available in many sizes This is the most popular choice on this page. Please use the key chart to find out what key you would need.

Item #CK4


13 Clock keys 13 Clock keys

The most common sizes in a assortment of single and double ended keys

Item #CK1-- $35

Double End Double End Clock Keys

Four most popular double end clock keys. There is always much confusion for people to get the proper double end key, so we offer this set of 4 keys most frequently used. These have the Small end for regulating some clocks as well as the end to wind.

Item #CK2-- $19

Schatz 400 Day Schatz 400 Day Clock Key

#3 size for lantern style 400 day clocks

Item #CK3-- $12

Alarm Keys Alarm Clock Keys

A dozen assorted small keys for alarm style wind up clocks. These are for clocks such as big ben or baby ben styles as well as others.

Item #CK5-- $13


Grandfather Crank Grandfather Clock Key Crank

Available in 5 sizes. This crank is brass with a wood handle.

Item #CK6-- $19

OGee Clock Key OGee Clock Key

Available in 0 to 13. This crank is usually used for the OGee mantle clock.

Item #CK7

5 Prong Key Set x2 5 Prong Clock Key Set

These two 5 prong clock keys will cover just about every clock winder.

Item #CK8 -- $19

GF Clock Crank #8 GF Clock Crank

#8 Crank -fits just about all modern clocks such as Hermle, and Kieninger.

Item #CK9-- $19


French Style French Style Clock Key

Available in all sizes. Please use the key size chart on the top of the page.

Item #CK10

Door Key Clock Door Key

This door key fits most modern clocks such as Howard Miller and others.

Item #CK11-- $9

Hermle Key Hermle Clock Key

#8 Key -fits most Large Hermle model clocks, #4 Key -fits most Small Hermle model clocks.

Item #CK12

Clock Key Gauge Clock Key Gauge

If you have many keys and do not know what size they are, this gauge will help. Just put the key on the correct post and it will tell you what size it is.

Item #CK13-- $21

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